SNLA452 August   2025 DP83TD510E

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Troubleshooting the Application
    1. 2.1 Schematic and Layout Checklist
    2. 2.2 Component Checklist
    3. 2.3 Device Health Checks
      1. 2.3.1 Check Voltage Supply Pins
      2. 2.3.2 Probe the RST_N Pin
      3. 2.3.3 Probe the CLKOUT Pin
      4. 2.3.4 Probe the SMI Pins
    4. 2.4 Read and Check Register Values
    5. 2.5 Verifying Strap Configuration
    6. 2.6 Loopbacks
    7. 2.7 MDI Health Checks
      1. 2.7.1 Link Up Common Issues
      2. 2.7.2 Transmit Level
        1. 2.7.2.1 Change Transmit Level
      3. 2.7.3 Time-Domain Reflectometry
      4. 2.7.4 Signal Quality Check
      5. 2.7.5 MDI Test Modes
    8. 2.8 MII Health Checks
      1. 2.8.1 RGMII
      2. 2.8.2 RMII
      3. 2.8.3 MII
  6. 3Summary
  7. 4References

2.3.1 Check Voltage Supply Pins

Before delving onto more complex diagnostics, this is essential to establish that the PHY is correctly powered. The DP83TD510E supports both single and dual supply operations. For single supply operation, DVDD must be shorted to C_EXT, measure the voltages at pins VDDA and VDDIO is needed. However, in dual supply operation, check all three voltage pins, VDDA, VDDIO, and DVDD to make sure that the voltages are stable and within the tolerance listed in Table 2-1. Also make sure that the correct decoupling capacitors (1uF, 100nF, 10nF) are used for both single and dual supply configurations.

These voltages are designed to be measured on the PHY voltage input pins, or as close to the input pins as possible

Table 2-1 Expected Voltage Level for Power Pins
Pin NamePin NumberDescriptionMINNOMMAXUNIT
DVDD 1.01Digital Supply0.901.01.1V
VDDA 1.83Analog Supply1.621.81.98V
VDDA 3.3Analog Supply3.03.33.6V
VDDIO17Digital Supply Voltage, 1.8V operation1.621.81.98V
Digital Supply Voltage, 2.5V operation2.252.52.75
Digital Supply Voltage, 3.3V operation3.03.33.6